Make sure everything is easy to locate on your website. Spend some serious thought on how everything on your site will be laid out. When content is randomly thrown on your site with little thought to the layout, you are making things harder for the people whose use of your site ensures your online success - your site visitors.
To help your visitors be able to easily read your site, you should design it using contrasting colors. If you use colors that contrast, it makes the text stand out. If you have black text with a black background you will not be able to see the information, but if you have black text with a white background it becomes simple to read.
Do not use images for your background. When you think about some of the biggest websites on the Internet, they do not have images as backgrounds. When you use image backgrounds, you represent yourself as someone who is not well-versed in web designing. Images as backgrounds also cause your site to load slower, which can lead to user frustration.
Test your website in the most popular browsers and platforms to make sure that it displays correctly. Sometimes scripts that work in one browser may not produce the same results in another browser. So you may need take extra measures, like adding a function for browser detection, in order to ensure that your website will display properly under most conditions.
Avoid using frames. Most sites have abandoned frames on their own as better alternatives have become available, but there are still sites out there that are trapped in 1996. Alternatives to navigational frames include fixed-position navigation panels, having navigation in multiple areas (e.g. left and bottom) or simplifying page structure so that navigational links are never far away.
Break up long text blocks. Having a huge wave of text is unnecessary for any site, especially when you can break it up by using images, or even separating it into different pages. Boring your viewers will only make them leave, so keep things as simple and fresh as possible.